And my pick is my ol' standby for lo - these many years: IMR 4350!
^^^^^^^+1,000^^^^^
This is the one powder I have pretty much narrowed my big game rifles down to sans my 270Win using RL26 and 150gr. LRAB's.
243Win/100gr. Hornady, Daughter's 270 Win/129gr. LRX and my 30-06/165gr. Speer Grand Slam or TTSX. Shoots at least MOA with all and a little better with most!
I stocked up when the gettin was good and am pretty well set forever!
Elk Country